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Finding the Fourth Proportional to 28,113.21, 38,798.70 and 15,540.39

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Solution

The fourth proportional to 28,113.21, 38,798.70 and 15,540.39 is: 21,447.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,113.21 : 38,798.70 = 15,540.39 : x
  2. Step 2: Convert to fraction form
    28,113.21/38,798.70 = 15,540.39/x
  3. Step 3: Cross multiply
    28,113.21x = 38,798.70 × 15,540.39
  4. Step 4: Simplify right side
    28,113.21x = 602,946,929.49
  5. Step 5: Solve for x
    x = 602,946,929.49/28,113.21
  6. Step 6: Final answer
    x = 21,447.10

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.